public final Class UnmodifiableMap<K, V>

Overrides org.apache.commons.collections4.map.AbstractMapDecorator.clear.

Implements java.util.Map.clear, org.apache.commons.collections4.Put.clear.

Doc from java.util.Map.clear.

Removes all of the mappings from this map (optional operation). The map will be empty after this call returns.

Annotations

@Override

Overrides org.apache.commons.collections4.map.AbstractMapDecorator.entrySet.

Implements java.util.Map.entrySet, org.apache.commons.collections4.Get.entrySet.

Doc from java.util.Map.entrySet.

Returns a Set view of the mappings contained in this map. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa. If the map is modified while an iteration over the set is in progress (except through the iterator's own remove operation, or through the setValue operation on a map entry returned by the iterator) the results of the iteration are undefined. The set supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Set.remove, removeAll, retainAll and clear operations. It does not support the add or addAll operations.

Returns:Set<Map.Entry<K, V>>

a set view of the mappings contained in this map

Annotations

@Override

Overrides org.apache.commons.collections4.map.AbstractMapDecorator.keySet.

Implements java.util.Map.keySet, org.apache.commons.collections4.Get.keySet.

Doc from java.util.Map.keySet.

Returns a Set view of the keys contained in this map. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa. If the map is modified while an iteration over the set is in progress (except through the iterator's own remove operation), the results of the iteration are undefined. The set supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Set.remove, removeAll, retainAll, and clear operations. It does not support the add or addAll operations.

Returns:Set<K>

a set view of the keys contained in this map

Annotations

@Override

Overrides org.apache.commons.collections4.map.AbstractIterableMap.mapIterator.

Implements org.apache.commons.collections4.IterableGet.mapIterator.

Doc from org.apache.commons.collections4.map.AbstractIterableMap.mapIterator.

Obtains a MapIterator over the map.

A map iterator is an efficient way of iterating over maps. There is no need to access the entry set or use Map Entry objects.

IterableMap<String,Integer> map = new HashedMap<String,Integer>();
MapIterator<String,Integer> it = map.mapIterator();
while (it.hasNext()) {
  String key = it.next();
  Integer value = it.getValue();
  it.setValue(value + 1);
}

Returns:MapIterator<K, V>

Doc from org.apache.commons.collections4.IterableGet.mapIterator.

a map iterator

Annotations

@Override

Overrides org.apache.commons.collections4.map.AbstractMapDecorator.put.

Implements java.util.Map.put, org.apache.commons.collections4.Put.put.

Doc from java.util.Map.put.

Associates the specified value with the specified key in this map (optional operation). If the map previously contained a mapping for the key, the old value is replaced by the specified value. (A map m is said to contain a mapping for a key k if and only if m.containsKey(k) would return true.)

Parameters

key:K

key with which the specified value is to be associated

value:V

value to be associated with the specified key

Returns:V

the previous value associated with key, or null if there was no mapping for key. (A null return can also indicate that the map previously associated null with key, if the implementation supports null values.)

Annotations

@Override

Overrides org.apache.commons.collections4.map.AbstractMapDecorator.putAll.

Implements java.util.Map.putAll, org.apache.commons.collections4.Put.putAll.

Doc from java.util.Map.putAll.

Copies all of the mappings from the specified map to this map (optional operation). The effect of this call is equivalent to that of calling put(k, v) on this map once for each mapping from key k to value v in the specified map. The behavior of this operation is undefined if the specified map is modified while the operation is in progress. If the specified map has a defined encounter order, processing of its mappings generally occurs in that order.

Parameters

mapToCopy:Map<? extends K, ? extends V>

mappings to be stored in this map

Annotations

@Override

Overrides org.apache.commons.collections4.map.AbstractMapDecorator.remove.

Implements java.util.Map.remove, org.apache.commons.collections4.Get.remove.

Doc from java.util.Map.remove.

Removes the mapping for a key from this map if it is present (optional operation). More formally, if this map contains a mapping from key k to value v such that Objects.equals(key, k), that mapping is removed. (The map can contain at most one such mapping.)

Returns the value to which this map previously associated the key, or null if the map contained no mapping for the key.

If this map permits null values, then a return value of null does not necessarily indicate that the map contained no mapping for the key; it's also possible that the map explicitly mapped the key to null.

The map will not contain a mapping for the specified key once the call returns.

Parameters

key:Object

key whose mapping is to be removed from the map

Returns:V

the previous value associated with key, or null if there was no mapping for key.

Annotations

@Override

Factory method to create an unmodifiable map.

Parameters

<K>

the key type

<V>

the value type

map:Map<? extends K, ? extends V>

the map to decorate, must not be null

Returns:Map<K, V>

a new unmodifiable map

Exceptions

NullPointerException:

if map is null

Since

4.0

Overrides org.apache.commons.collections4.map.AbstractMapDecorator.values.

Implements java.util.Map.values, org.apache.commons.collections4.Get.values.

Doc from java.util.Map.values.

Returns a Collection view of the values contained in this map. The collection is backed by the map, so changes to the map are reflected in the collection, and vice-versa. If the map is modified while an iteration over the collection is in progress (except through the iterator's own remove operation), the results of the iteration are undefined. The collection supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Collection.remove, removeAll, retainAll and clear operations. It does not support the add or addAll operations.

Returns:Collection<V>

a collection view of the values contained in this map

Annotations

@Override